Packaging

The "dildo" design was originally made with LBB 5: High Guard.

It's a TL 12 100 ton, jump 2, 2g design.

GURPS: Traveller uses an entirely different ship design system...  Still 100 ton, J2, M2; but now TL10 because GURPS uses a different scale.

The maneuver drive takes up more space.  There's no fuel requirement for the maneuver drive.  Streamlining takes up space.  The way the design system works the power-plant is not a distinct system but is bought in "slices" with the Engineering controls and the power needs of the machinery added (so the maneuver drive includes power plant as part of the mass and volume).

What this means is the machinery that fit perfectly in a belt around the outside of the cylindrical hull no longer fits in it.  But other spaces become available inside the main hull so the deck below the control room is now machinery with fuel below that instead of being just fuel; other fuel is now above the cargo/air-raft bay.

I lose the deck dedicated to a common, but that's taken care of by changing the size and shape of the staterooms.  Let's be honest, the original Sulieman deck plans over-allocated for common area compared to the space made available by the design.